Genuine OEM Audi Lower Radiator Coolant Hose, part number 4F0145923A. This hose is engineered to transport cooled fluid from the radiator back to the engine, completing the primary cooling circuit. It is a vital component for maintaining engine temperature regulation. Weighing 0.156 kg and measuring 0.365 m in length, this hose is designed for precise fitment and optimal flow. Choosing a genuine OEM coolant hose ensures correct routing, material integrity, and resistance to temperature extremes and pressure fluctuations, preventing leaks and system failures.